20060107, 10:21  #1 
"Tony Gott"
Aug 2002
Yell, Shetland, UK
3×7×17 Posts 
Calculation of P90 time for each exponent
I had a quick look but couldn't find anything quickly.
What is the formula for working out the number P90 cou years by exponent? I am looking through the number of bad results and thought it would be instructive to know how much time has actually been lost by the submission of results by team/producer, which have later provided to be incorrect. 
20060107, 10:33  #2 
Dec 2003
Hopefully Near M48
2·3·293 Posts 
This question was already answered in earlier threads. The Team Prime Rib website has a calculator that calculates the number of CPU years that GIMPS awards for any given exponent. And buried somewhere deep inside this forum is the explicit formula (actually different formulas are used for different ranges); I would know because I asked this question a long time ago and it was answered.

20060107, 10:34  #3 
Mar 2004
Belgium
7×11^{2} Posts 
And is it also possible to calculate the P90 (months, years, ...) time for other numbers like:
13236795*2^215582  1 is prime! 64904 digits 
20060107, 10:44  #4 
"Tony Gott"
Aug 2002
Yell, Shetland, UK
3×7×17 Posts 
I am aware of the calculator, but I was after the formula, as I have 853 exponents to evaluate .......

20060107, 15:38  #5  
Dec 2003
Hopefully Near M48
3336_{8} Posts 
Found it!
http://www.mersenneforum.org/showthr...&highlight=P90 Scroll down to Post #8 by Joe_O. Quote:
Last fiddled with by jinydu on 20060107 at 15:39 

20060107, 15:54  #6 
"Tony Gott"
Aug 2002
Yell, Shetland, UK
357_{10} Posts 
Many thanks for the link ....

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